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Old 01-06-2015, 09:15 PM   #1
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Default Catalytic Dead?

This is probably a no brainer. But since its -20 outside, I'll take advice over troubleshooting. Today my '93 88 ran all good a couple times. Then I got in to go again, ran rough. got worse as I drove sputtering, backfiring, no power. Oh the way home, I noticed sparks (yes sparks) coming out of the tailpipe. So my conclusion would be the c.c. had a fatal meltdown. Thoughts?
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Old 01-06-2015, 10:25 PM   #2
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Could be. Remove the O2 sensor and see if it drives better.
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Old 01-07-2015, 12:02 AM   #3
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Do you have a generous muffler shop nearby? Maybe they could punch a hole in front and behind the cat to see if there'* any airflow
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Old 01-07-2015, 09:11 AM   #4
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Unfortunately, no. I live in the sticks and I am going to have to call and even see who does exhaust. Although I can disco the 02 sensor, I cannot see that causing sparks to blow out the tailpipe. Agreed?
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Old 01-07-2015, 10:44 AM   #5
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you take it out to see if the added exhaust flow helps.
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Old 01-17-2015, 07:19 PM   #6
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I took it out and there was not material left inside. So I figured its broke up and clogged the muffler. replace the muffler, still runs like crap
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Old 01-17-2015, 08:31 PM   #7
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did you replace the cat?check the whole pipe for clogs?
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Old 01-21-2015, 10:24 PM   #8
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Did not replace the cat. Its straight through. Took all the exhaust down checked, not a darn thing in that pipe
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Old 01-22-2015, 11:30 AM   #9
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By runs like crap, you mean no power?

Did you try to road test the vehicle with the exhaust disconnected, to eliminate a back flow problem?

If you did, and it runs like crap, then back to basics.....if driven with a misfire, that misfire could have taken out the cat.....

Check that f/p reg hose for fuel....try driving with the MAF disconnected......check fuel pressure, and spark on all cylinders with a spark tester......

Scanned for codes?

losing coolant?
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Old 01-22-2015, 10:31 PM   #10
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The car would not scan at all. So I am going to do spark test tomorrow, just picked up the tool. MAF is new, so I don't think that'* the issue. Hoping its a coil pack. Fingers crossed
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